Piston for engines



A.`D. LANEVILLE.

v PlsToN FOR ENGINES.

APPLICATION FILED NOV. l, 1919.

Patented Feb. 8, 1921.

Fig@ ALBERT I). LAYNE'VILLE, 0F MANCHESTER, NEW HAMPSHIRE PISTON FOR ENGINES.

Specication of Letters Patent.

Patented Feb. 8, 1921.

Application led November 1,1919. Serial No. 334,938.

To all whom t may concern:

Be it known that I, ALBERT D. LANEVILLE, a citizen of the United States, and a resident of Manchesten'in the county of Hillsborough and State of New Hampshire, have invented certain new 'and useful Improvenients in Pistons for Emgines, of which the following is a full, clear, and exact specication.

In the majority of makes of internal combustion engines employed for the propulsion of automobiles and the like, it is a laborious and tedious job to remove the pistons therefrom for the purpose ofrenewing the packing rings.- The object of this invention is Vthe effecting of means whereby the packing rings may be renewed Without thus removing the pistons and disconnect-y ing many parts y,diilicult to reach and manipulate.

To this end I lprovide each piston with an easily removed portion in which the piston rings are carried, so that by simply unbolting the cylinder head member and taking out a couple of screws, such portion can be readily removed, the packing rings removed and reground, or fresh ones substituted therefor. v

VIn the drawings forming part of this specification, Figure 1 is a lon itudinal section through the line v3 3 in ig. 3. Fig. 2 is a side view of the piston showing immediately above it the removable portion in section. Fig. 3 is a plan view of the removable portion. Fig. 4 is a plan view of the piston without the removable portion. Fig. 5 is a deta'd sectional View showing the screw-lockingl device. Fig. 6 is a view of 'the same from a different angle.

For the sake of brevity, I will call the removable portion of the piston a cap. The main body of the piston is of well known construction, being of the bucket type, having the pitman 1 pivotally connected thereto by a pin 2.Y This piston body 3 is formed with a closedneck 4, having a shoulder 5, the neck being somewhat smaller in diameter than the interior of thev cap 6, while the exterior diameters of the cap and piston are alike.

In the periphery of the cap are the annular grooves 7 receivingthe packing rings 9,

which are of well known form and removable from the grooves 7 in the usual manner when the cap is outside of the engine cylinder.

is readily done when the lugs 10`and out of alinement With the lugs 11, and then giving the cap a partial rotation suiicient to bring the lugs 10 beneath the lugs 11, no direct pull can withdraw the cap from the piston. For insuring tightness, the lugs 10 and 11 are given slightly slanting coacting surfaces 13. Should this coaction prove insufficient, the stop-extensions 12 will prevent the cap from being turned so far as to disengage the lugs.

To hold the cap so thatl it cannot turn while in use and thereby free itself from the piston,-I prefer to provide one or more bolts 14 tapped into the neck and passing through the flat surface or top 15 of the cap, as shown in Figs. 1 and 3. For preventing these screws or bolts 14- from working out, a small hole 16 is drilled into .the cap at each side of a bolt head, and a piece of'spring wire 17 sprung into them in the slot 19 of the bolt head, as shown in Figs. 5 and 6. A small notch 2O in one edge of a slot 19 enables the wire 17 to be priedv out and the bolts to be unscrewed.

'Thus constructed, the cap 6 can be easily removed from the piston .without disturbing either the latter or any of its connections, and as easily returned thereto after the change in packing rings.

To insure a gas-tight t between the cap and piston, the edge of the cap is formed with an annular projection 21 fitting in a corresponding groove 22 having a gasket 24 therein, as shown in Fig. 1.

What I claim is:

1. A. piston having a neck at its upper end, a cupped member, said piston neck and cupped member having coacting lugs for enabling them to be turned into firm engagement,-removable means for locking said neck and member against accidental release, and

packing member.

means carried by said cuppedl 2. A piston having a neck at its upperl bolt having a slotted countersunk head, means removably .engaging said slot for locking'the bolt against accidental turning, and packing means carried bi said member.

3. A piston having a nec at its upper end, a cupped member equal to the piston in diameter, packing means carried by said member, said neck and member having coacting projections for enabling them to be turned into firm engagement, a bolt passing through the top portion of said member and screwing into said neck, the head of said bolt being slotted and countersunk, and a length of spring Wire lying in said slot and said top portion.

4. A piston having a neck and a shoulder,

vthe shoulderhavin an annular groove therein, a cup equal in iameter to the piston and having an annular projection fitting said groove, a gasket in said groove, means for locking said cup and piston iirmly together, and packing means carriedl by said cup.

1n testimony that I claim the foregoing invention, I have hereunto set my hand this 27th day of October, 1919.

' ALBERT D. LANEviLLFI. 

